Visual Studio 2012 crashes every time I try to debug with error CLR20r3

Not sure what was wrong but to fix it I had to delete the .sln files and the .csproj files and get them from TFS again for it to work. Don't know what was wrong with them but that worked. Thanks for your help guys!

Edit:

Above turned out to only work for a small amount of time. What seems to have made it work (for the last hour at least) was changing the number of Maximum Worker Processes in IIS back down to 1. Completely lost on why this worked :/

The issue is with web essentials, open VS 2012 Tools - Extensions and Updates - Uninstall web essentials

You can reinstall it if you want, seems to work fine

Thanks,

Sebastian

In may case the problem was caused by .NET Reflector. After uninstalling .NET Reflector debugging was working again without any problem.